
import {
	Blob,
	btoa,
	createImageBitmap,
	CSSStyleDeclaration,
	performance,
	document,
	DOMParser,
	EventTarget,
	fetch,
	Headers,
	HTMLCanvasElement,
	Image,
	HTMLImageElement,
	ImageBitmap,
	location,
	navigator,
	Request,
	requestAnimationFrame,
	cancelAnimationFrame,
	Response,
	URL,
	window,
	self,
	WebAssembly,
	Worker,
	XMLHttpRequest,
	ImageData,
	TextDecoder,
	core
	} from 'dhtml-weixin';
import TempNode from '../core/TempNode.js';
import { positionWorldDirection } from '../accessors/PositionNode.js';
import { nodeProxy, vec2 } from '../shadernode/ShaderNode.js';
import { addNodeClass } from '../core/Node.js';

class EquirectUVNode extends TempNode {

	constructor( dirNode = positionWorldDirection ) {

		super( 'vec2' );

		this.dirNode = dirNode;

	}

	setup() {

		const dir = this.dirNode;

		const u = dir.z.atan2( dir.x ).mul( 1 / ( Math.PI * 2 ) ).add( 0.5 );
		const v = dir.y.negate().clamp( - 1.0, 1.0 ).asin().mul( 1 / Math.PI ).add( 0.5 ); // @TODO: The use of negate() here could be an NDC issue.

		return vec2( u, v );

	}

}

export default EquirectUVNode;

export const equirectUV = nodeProxy( EquirectUVNode );

addNodeClass( 'EquirectUVNode', EquirectUVNode );
